Basics of congestion control?
Hi all,
could someone please explain what I can do with the new congestion control?
Do I understand it right that I can influence the flow control (e.g. amount of credits) with it so that I can avoid disruption (XmitWait, XmitDiscardedPackets) caused by congestion?
This is at least what we need. ;-)
Cheers,
Sebastian
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Hi Sebastian,
Quoted 7 lines · Sebastian Riemer
Hi all,
could someone please explain what I can do with the new congestion control?
Do I understand it right that I can influence the flow control (e.g. amount of credits) with it so that I can avoid disruption (XmitWait, XmitDiscardedPackets) caused by congestion?
Congestion control isn't a credit based mechanism. While InfiniBand flow control is defined between two ports of the same link, congestion control is working across the fabric between a congestion point (a switch) and a reaction point (source node). Reaction point implements a Congestion Control Table that contains an array of values of injection rate delay used to control congestion. You can find more information in the IBTA LWG Errata document 3Q2010.
-- Alex
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Quoted 7 lines · Alex Netes
Congestion control isn't a credit based mechanism. While InfiniBand flow control is defined between two ports of the same link, congestion control is working across the fabric between a congestion point (a switch) and a reaction point (source node). Reaction point implements a Congestion Control Table that contains an array of values of injection rate delay used to control congestion. You can find more information in the IBTA LWG Errata document 3Q2010.
Nice, thank you very much!
I've found the IBTA spec and the errata.
Cheers,
Sebastian
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